Stellar Scientific has a wide assortment of chemically resistant plastic and coated metal racks designed for the most common sized clinical laboratory tubes.
Durable polypropylene racks that can be stacked and hold glass tubes 12mm-20mm diameter.
Enameled wire racks for holding up to 108 vacutainer or blood tubes.
Snap-together microtube racks for 1.5/2.0mL micro centrifuge tubes
And much more